James B. Kaper,2
Evelyn A. Dean-Nystrom,3 and
Harley W. Moon1
Department of Veterinary Pathology, Iowa State University,1 Pre-Harvest Food Safety and Enteric Disease Research Unit, National Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, Iowa,3 Center for Vaccine Development and Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland2
Received 12 July 2004/ Returned for modification 20 August 2004/ Accepted 7 October 2004
Gnotobiotic piglets inoculated with Escherichia coli O157:H7, its luxS mutant derivative, or nonpathogenic E. coli were evaluated for attaching and effacing lesions. Although no differences in clinical symptoms were seen between pigs inoculated with the parent and those inoculated with the luxS mutant, the luxS mutant-inoculated pigs had a lower frequency of attaching and effacing lesions in the spiral colon than parent strain-inoculated pigs.
Present address: Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9048.
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